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Greyhawk served as a sergeant in the US Armed Forces during the World War II. During his last mission in the war, he obtained lethal radiation poisoning and decided to sacrifice himself when fighting against the Teutonic Knight, a Nazi super-soldier outfitted with the X-O Manowar armor.

In Tales of the Lost Land he appeared in Tal'Set's story to give advice after the latter received a gun from Gilad, a member of the Forever Family, and was terrified of using it, believing it would start an arms race. Greyhawk, having experience in the "most devastating global war in man's history," told Tal'Set to "hold it, aim it, pull the trigger" and that, based on the scientific advancements he knew were coming, the Turoks were already an "army of the walking dead." Using Greyhawk's advice, Tal'Set helped level the playing field between the Turoks and the Amaranthine Accordance, finally achieving technological progress.